实验2

问题1：确保输出的数值在374-465之间

问题2：输出4个“学号+0+三位随机数”形式的随机数值

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#define N 5
#define N1 374
#define N2 465

int main()
{
    int number;
    int i;
    srand(time(0));
    for (i = 0; i < N; ++i) {
        number = rand() % (N2 - N1 + 1) + N1;
        printf("202383290452%04d\n", number);

    }
    return 0;






}

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
int main()
{
    char t = ' ';
    while (scanf("%c", &t) != EOF)
    {
        switch (t)
        {
        case'r':printf("stop!\n"); break;
        case'g':printf("go go go\n"); break;
        case'y':printf("wait a minute\n"); break;
        default:printf("something must be wrong...\n"); break;
        }
        getchar();
    }
}

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
int main()
{
    int answer = 0;
    int number = 0;
    int i = 0;
    srand(time(0));
    number = rand()%(30 - 1 + 1) + 1;
    printf("guess your lucky day\n"
        "开始喽，你有三次机会，猜吧（1~30）："
    );
    for (i = 1; i <= 3; i++)
    {scanf("%d", &answer);
        if ((answer - number) > 0)
            printf("late\n");
        else if ((answer - number) == 0)
        {
            printf("correct\n");
            exit(0);
        }
        else
            printf("early\n");
    }

    
    printf("your lucky day is:%d", number);









}

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
int main()
{
    int up = 1;
    int down = 0;
    int n = 1;
    int i = 1;
    double s = 0;
    int a = 1;

    while (scanf("%d%d", &n,&a) != EOF)
    {
        for (i = 1; i <= n; i++)
        {   up = i;
            down = (down * 10 + 1) * a;
            s = (double)s +(double) up / down;
        }
    printf("n=%d a=%d s=%lf", n, a, s);
    }
    
}

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
int main()
{
    int line = 1;
    int column = 1;
    int value = 1;
    for (column = 1; column <= 9; column++)
    {
        for (line = 1; line <= column; line++)
        {
            value = line * column;
            printf("%d×%d=%d\t", column, line, value);
        }
        printf("\n");
    }








}

#define _CRT_SECURE_NO_WARNINGS
#include<stdlib.h>
#include<stdio.h>
void people(char a, char b, char c, int all, int n)
{
    int j;
    for (j = 0; j < n; j++)
        printf("   \t");
    int h;
    for (h = 2 * (all - n) - 1; h > 0; h--)
        printf("%c%c%c\t", a, b, c);
    printf("\n");}
int main() {
    int i=0, j=0, n=1;
    printf("input n:");
    scanf("%d", &n);
    for (i = 0; i < n; i++)
    {
        people(' ', 'o', ' ', n, i);
        people('<', 'H', '>', n, i);
        people('I', ' ', 'I', n, i);
    }
    return 0;

}